Pumping two dilute gas Bose-Einstein condensates with Raman light scattering

TL;DR

This paper introduces an optical Raman scattering method to enhance atom numbers in two dilute gas Bose-Einstein condensates by exploiting quantum interference, potentially enabling atom laser pumping.

Contribution

It presents a novel Raman-based technique leveraging quantum interference to increase condensate atom numbers, advancing atom laser development.

Findings

Quantum interference suppresses atom scattering out of condensates.

Condensates grow without increasing scattering rate.

Potential application as an atom laser pump.

Abstract

We propose an optical method for increasing the number of atoms in a pair of dilute gas Bose-Einstein condensates. The method uses laser-driven Raman transitions which scatter atoms between the condensate and non-condensate atom fractions. For a range of condensate phase differences there is destructive quantum interference of the amplitudes for scattering atoms out of the condensates. Because the total atom scattering rate into the condensates is unaffected the condensates grow. This mechanism is analogous to that responsible for optical lasing without inversion. Growth using macroscopic quantum interference may find application as a pump for an atom laser.